Smartctl Open Device Dev Sda Failed Dell Or Megaraid Controller Please Try Adding 39d Megaraid N 39 Extra Quality [verified]

The error smartctl open device: /dev/sda failed: DELL or MegaRAID controller, please try adding -d megaraid,N is not a bug—it is a sign that you need to tell smartctl which physical drive behind the RAID controller to query.

: If the command still fails with minor errors, you can try adding the -T verypermissive flag to ignore mandatory SMART command failures that the controller might be blocking. Troubleshooting Summary

This ensures metric tracking software properly separates individual disk stats rather than overwriting telemetry streams under a single block namespace.

It may show /dev/sda -d megaraid,0 if previously detected, but not guaranteed. The error smartctl open device: /dev/sda failed: DELL

| Attribute | ID | Raw Value Meaning | Action Threshold | | :--- | :--- | :--- | :--- | | | 5 | Number of sectors remapped to spare area | > 0 – Monitor closely; rising count indicates media degradation | | Current_Pending_Sector | 197 | Sectors that are unstable but not yet remapped | > 0 – Immediate attention required; often precedes drive failure | | Offline_Uncorrectable | 198 | Sectors that could not be corrected during offline testing | > 0 – More serious than pending sectors; consider replacement | | UDMA_CRC_Error_Count | 199 | Interface communication errors (cable, backplane, or power issues) | Repeated increase – Likely a cabling/connection problem, not the disk itself |

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#!/bin/bash # Loop through possible device IDs (0 to 127) for i in 0..127; do # Try to get basic info from the disk output=$(smartctl -i -d megaraid,$i /dev/sda 2>&1) # Check if the command was successful and got a device model if echo "$output" | grep -q "Device Model"; then echo "Found disk with Device ID: $i" echo "$output" | grep -E "Device Model:|Serial Number:|SMART support" echo "---" fi done It may show /dev/sda -d megaraid,0 if previously

: The logical device name (though behind a RAID, this often acts as the entry point to the controller). Error with smartctl on Dell/Megaraid · Issue #660 - GitHub

To resolve this issue, you need to specify the correct device type using the -d option, which allows you to specify the disk type and number. For MegaRAID controllers, the correct syntax is:

Replace 0 with your actual Device ID and /dev/sda with your controller's device node. Troubleshooting Common Issues Smartmontools with MegaRAID Controller - Thomas-Krenn.AG If you share with third parties, their policies apply

To check the health of the first physical disk (Device ID 8, usually indexed as 0 or 1 in smartctl ): sudo smartctl -a -d megaraid,0 /dev/sda Use code with caution.

One of the most common reasons the error persists after adding -d megaraid,N is using an incorrect device ID. Here are three reliable ways to identify the correct device ID for each physical disk.